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What is a Fluid?

A fluid is anything that would spill or float away if it
weren't in a container (unless it's big enough to be held
together by gravity like a star). If you can stir it up with
a spoon or blow it through a straw, it's a fluid. Water is
a fluid and so is air. In fact, all liquids and gases are fluids.
In space and inside stars there's also another kind of fluid
called a plasma.

The molecules
in a solid are stuck together, but in a fluid they're
free to move past each other. So if you had very small hands
you could push one molecule of a fluid one way and another molecule the other
way and off they would go in the direction you pushed them.

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